An individual named Ken Allred did a tremendous disservice to your readership by spreading falsehoods about the topic of human-caused climate change and about my scientific work specifically in his misguided, untruth-riddled recent commentary (“Denying the deniers,” St. Albert Gazette, June 25).
It is difficult to find a single true statement in his rather obtuse and confused screed. Indeed it is mostly just an embarrassing regurgitation of the standard litany of fossil fuel industry climate change denial talking points (“CO2 is good for you,” “scientists are in it for the money,” “it’s just a hypothesis,” etc.).
Despite the insistence by deeply misinformed individuals like Mr. Allred there is still some sort of debate about the existence of climate change, there is in fact an overwhelming consensus among the world’s scientists that climate change is real and human-caused. That is the conclusion of the U.S. National Academy of Sciences, the national academies of all other industrial nations, the more than 30 science organizations in the U.S. that have weighed in on the matter, and more than 97 per cent of all scientists who have published on the science.
Mr. Allred maligns the well-known hockey stick temperature curve which demonstrates that recent warming is unusual over at least the past 1,000 years, falsely claiming that it was skewed to support [my]conclusions. As I recount in The Hockey Stick and the Climate Wars, this work has been attacked by industry-funded climate change deniers for more than a decade owing to the simple, undeniable message it conveys about the dramatic impact human activity is having on Earth’s climate.
Mr. Allred conveniently fails to note that the highest scientific body in the U.S., the National Academy of Sciences, affirmed my research findings in an exhaustive independent review published in June 2006 (see e.g. “Science Panel Backs Study on Warming Climate,” New York Times, June 22, 2006).
In the decade and a half since our original published work, dozens of groups of scientists have independently reproduced, confirmed, and extended our findings, including most recently an international team of nearly 80 scientists from around the world, publishing in the premier journal Nature Geoscience. The most recent report of the Intergovernmental Panel on Climate Change, the most authoritative assessment of climate science available, concluded that recent warmth is likely unprecedented over an even longer timeframe than we had concluded (at least the past 1,400 years). Of course, the “hockey stick” is only one of numerous independent lines of evidence that have led the world’s scientists to conclude that climate change is (a) real, (b) caused by the burning of fossil fuels, and (c) a grave threat if we do nothing about it.
Readers interested in the truth behind the science, rather than the falsehoods and smears perpetuated by dangerously uninformed individuals like Mr. Allred, should consult scientist-run websites like skepticalscience.com, or books on the topic like my own Dire Predictions: Understanding Climate Change. Let’s get past the fake debate about whether the problem exists, and on to the worthy debate about what to do about it.
Michael E. Mann, Distinguished Professor of Atmospheric Science and Director of the Earth System Science Center at Penn State University